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Once BW clock has hung the only way I can stop the bottom half turning black and being unresponsive is to uninstall sunrise_clockinfo. I guess there could be more than one issue present here. It might be that BW clock is writing to storage after every UI interaction when perhaps it should only do so after the clock has locked. I know this was a problem before on BW clock. Or maybe the clock_info is writing state after every interaction.
Just a note that you can get the hang even without sunrise. Just start the clock and start tapping very quickly.